Improved cae-wheel



JOHN RADDIN, OF LYNN, MASSACHUSETTS.

Letters Patent No. 74,939, dated .Ferum'y 25, 1868.

IMPROVED CAR-WHEEL.

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TO ALL WHOM IT MAY CON CERN Be it known that I, JOHN RADDIN, of Lynn, inthe county of Essex, and State of Massachusetts, have invented an Improved Oar-Wheel; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention, sulicient to enable those skilled in the art to practise it.

The invention relates to the construction of castrailway-car wheels, with particular reference to a provision for radial yield between the'hub and tread of the wheel. p

The invention consists, in connection with making the hub of flanged pieces independent from the web and bolted together and upon the opposite surfaces of the web, of cushioning the hub relatively to'thc tread, by means of rubber or other elastic packing surrounding the bolts. V

It also consists in making the hub and web of independent castings, when the central part ot"`the web has flat or parallel faces, to the opposite sides of which the anges projecting from the hub are bolted, and when the hub is madssecticnal, or in two pieces, the central part of one'of which extends through the web, and

through and ts in the central part of the opposite'hulrpiece.

(This'latter feature is shown in United States Letters Patent, No. 64,796, granted to me, May 14, 1867, but it forms no part ofthe invention therein claimed, such patent relating entirely tothe interposition of rubber or similar elastic material between the hub and theweb.)

The drawings representa car-wheel embodying myrinrvention, A showing a side view, but with one of the hub-pieces removed; B, a central cross-section.

a denotes th'e wcb,' the periphery or tread, c c the hub. The web and tread are cast integral, and the web has a large central opening, d. Each hub-piece c c isrnade with a flange, e, the inner surface of which'is at, and ts upon a corresponding flat or plane surface, on the adjacent side of the web a. The hub-piece e extends through the wheel, and the hub-piece c fits thereupon, as seen at B. Through the web, adjacent to the hub-iiangcs, is a series ofbolt-holesf, for reception of bolts g, which extend through the two iianges e, and the web, as seen at B, the bolt-holcs through the flanges being made to correspond in diameter to the size of the bolts, orV so that there shall be no lateral play between the bolts and the web, While each bolt-hole through the web is made larger than thc bolt, and receives a tube or peeking of rubber or other elastic material, t, a space being left between the web and the hub for slight radial movement of the hub towards the periphery ofthe wheel. The parts being secured together by the bolts, and the nuts thereupon, as seen at B, it will readily be seen that the stress produced byany pressure between the hub and the tread is received upon the packing surrounding the bolts, while the construction and relative arrangement of the parts of the hub, the web, and their connections, are such as to insure security and strength in the wheel.

A rubber ring may -be interposed between the hub and web, as seen a't C, (and nsshown in mypatont above referred to,) but by cushiningthe bolts as describcd'this may be dispensed witl.

A wheel may also be constructed having the specic arrangement of the sectional hub and the wheel-web, `(the bolt-holesfbcing in such case made ofpcorresponding or approximate diameter to thc bolts,) but I prefer the construction shown at B, with the employment et' the elastic packing. This pecking may bemade of rubber, lor its compounds, or of gutta perche, sott wood, or other equivalent material. I consider rubber or a rubber compound, however, to be the most reliable.

This construction for a cast-metal wheel facilitates the casting of a wheel possessing requisite strength from hubto tread, because, the web and tread being cast independently from thebub, and being of about equal thickness throughout, the casting cools otl' equally throughout, whereas in the common car-wheel, in which the hub is cast with the wheel, the great thickness ot` the hub causes'it to cool ofi' more slowly than the `web portion, which strains and weakens the casting.

I claim, in combination with the'web a, -the sectional hub c c', andthe bolts g, constructed and arranged as shown and described, thc elastic packing t, and the bolts, sub'stantiallyas and for the purpose set forth.

` 4 JOHN RADDIN.

Witnesses:

J. B. CROSBY, FRANCIS GoULD. 

